Internally-heated cooking-oven and the like.



G. H. D. HUNTER. INTLRNALLY HEATED 0001mm OVEN AND THE LIKE.

APPLICATION FILED MAY 27, 1918.

Patented June 2, 1914.

2 SHEETS-SHEET 1.

amrzwi 12. Hmir wyjmw COLUMBIA PLANOCIRAPXI CO.. WASHINGTON, n. c

0. H. D. HUNTER.

INTERNALLY HEATED COOKING OVEN AND THE LIKE.

APPLICATION FILED MAY 27, 1913.

Patented June 2, 1914.

2 SHEBTS-$HEET 2.

COLUMBIA PLANOGRAPH COUWASHINGTON, n. c.

CHARLES IICPE DOUGLAS HUNTER, 0F MELBOURNE, VICTORIA, AUSTRALIA.

INTEBNALLY-I-IEATED GODKING-OVEN AND THE LIKE.

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Specification of Letters Patent.

Application filed May 2'7, 1913.

Patented June 2, 1914. $cria1No. 770,220.

To (ZZZ whom it may concern:

Be it known that 1, Cinemas Horn Douc- LAS HUNTER, a subject of the King of Great Britain, residing at 175 William street, Melbourne, in the State of Victoria, Commonwealth of Australia, manufacturer, have invented certain new and useful Improvements in Internally-Heated (looking-Ovens and the like, of which the following is a specification.

This invention relates to improvements in cooking stoves and the like, and refers more. particularly to one fire stoves having a single oven and where the fire grate is arranged in a central position above or at one side of the same. The improvements by slight al terations are applicable to cooking ranges having double ovens and the fire grate arranged between the same.

The object of the invention is to provide means whereby instead of the heat from the fire being circulated in flues disposed about the outside of the oven proper as in ordinary stoves the heat is circulated through the interior of the oven and in such a manner that there is no waste heat as all the heat available from the combustion of the fuel is utilized in heating the oven and in such a manner that the same is maintained at an even or uniform temperature. To accomplish these objects the ordinary outside fines or passages through which the heat fumes pass are dispensed with and a series of tubes of regular or irregular shape are arranged inside the oven in such a manner that the heat from the fire circulates through the said tubes and in so doing distribute the heat through the oven much more evenly and with less consumption of fuel than can be done at present with stoves having the outside flues. Means are provided for permit ting brushes and the like to be passed through the tubes and flues to remove all soot and ashes from the same.

It will be understood that the arrangementof the tubes will depend on the position in which the fire grate is situated, but in all cases where circulating tubes are employed they will be arranged inside the oven proper.

In order that the invention may be more clearly understood reference will now be made to the accompanying sheets of drawings vhich illustrates a one fire stove embodying the improvements.

Referring to the drawings :-Figure 1 is a front elevation. of an ordinary one fire stove with the fire grate arranged in a central position above the oven, and Fig. 2 is a vertl-=- cal section of same. Fig. 3 is a section on line a-a of Fig. 2. Fig. i is a view similar to Fig. 2 showing a modification in the arrangement of the circulating tubcs. Fig. 5 is a sectional plan taken on line b-o of Fig. 4. Fig. 6 a sectional plan taken on line c-c of Fig. 41. Fig. 7 is a vertical section of a one fire stove having the fire place ar ranged at one side of an oven. F 8 is a vertical section showing a further modification of the circulating tubes or flues. Figs. 9 and 10 are sectional plans on lines (Z-(Z and 6+6 respectively of Fig. 8.

In construction a cooking stove as shown in Figs. 1 to 3 of the drawings the oven A may extend the full width of the frame work, and be fitted internally with a series of heat circulating tubes B, B of any desired shape or section, the vertical tubes B being supported from the top plate A with their ends projecting slightly above the same. These vertical tubes 13 are arranged in pairs at both sides of the oven and each pair is connected at their lower ends to a horizontal tube B which is also arranged inside the oven just above the bottom plate A The ends of the horizontal tubes B project through the side walls and preferably are beveled off and furnished with gravity covers or doors B for cleaning out purposes.

The fire-place C is situated in a central position at the top of the oven A and if desired may be made removable. The fireplace is constructed as shown in Figs. 2 and 3 with a side wall C and a portion of its back C extending up to the top plate D of the stove in order to form a passage or flue C for delivering the smoke and fumes from the discharge ends of the tubes B to the dis charge duct or flue E arranged at the back of the fire-place C.

It will be seen that the heat fumes from the fireplace C pass in the direction indicated by the arrows down the tubes B at one side of the oven, through the horizontal tubes B up the tubes B at the opposite side of the oven and thence through the flue C to the outlet duct or flue F. Thus the heat circulates through the interior of the oven and in so doing makes a three quar ter circuit of the same.

In order to clean the tubes a brush may be inserted in the vertical tubes B and then through the horizontal tubes B the soot being discharged through either end of the lastmentioned tubes. In order to convey the heat from the fire-place C direct to tubes at each side of the oven A as indicated by the arrows in Figs. at, 5 and 6 a suitable flue or duct C is formed between the top 1 of the oven A and the top plate D of the stove. This flue C connects with the flue C leading to the discharge duct E. One of the vertical tubes B of each pair terminates in the flue just above the top A of the oven A while the other tube B of the pair passes through the flue C into the space between the top of the flue G and the top plate D of the stove. Thus it will be seen that the heat from the fire-place C passes into the longest of the tubes B at each side of the oven A, through the horizontal tubes B up the short vertical tubes B and thence into the flue 0* which conveys or delivers the smoke and fumes to the discharge duct By this arrangement of tubes the same temperature of heat is delivered into the oven at each side thereby causing all parts of the oven to be main tained at the same temperature. In order to enable the short vertical tubes B to be cleaned the top portion of the flue 0* is furnished with removable plates C which when removed enable a brush to be inserted in the said short interval tubes B.

To support the oven sheets A for carrying cooking vessels suitable adjustable clamps B are attached at desired points to any number of the vertical tubes B and these clamps are so constructed that they may be held firmly in position and at the same time support the oven sheets A.

In the stove shown in Fig. 7 the fire-place is situated at one side of the oven and the tubes B and B are arranged similarly to those shown in Figs. 1 to 3 of the drawings. In order to cause the heat to circulate through the oven a suitable semi-circular removable cover C is adapted to be placed over the top ends of all of the series of vertical tubes B located next the fire-place C. This cover C forms the flue or passage C leading to the discharge duct E, and is made removable in order to enable the tubes B to be cleaned. The direction taken by the heat fumes is indicated by the arrows passing from the fire-place to the flue E.

In the modified arrangement shown in Figs. 8, 9 and the horizontal tubes B shown in other figures are dispensed with, and the vertical tubes B are adapted to deliver the heat fumes through the oven A into the ordinary chamber or flue C situated under the bottom of the oven, and in which flue is arranged the necessary baffle plates C which cause the fumes to circulate about the bottom of the oven before passing up the back flue C behind the oven A to the discharge duct E.

In order to cause the heat to circulate about the back of the even, a suitable adjustable damper or battle C is fitted in the back flue C to cause the heat fumes to spread and take a course indicated by the arrows in dotted lines in Fig. 8. The said damper C can be supported pivotally in the flue C and it can be provided with an externally disposed operating handle for adjusting it to any desired position therein.

It will be seen that at the left hand side of each of the Figs. 8, 9 and 10 is shown a series of circular tubes B while on the right hand side of the same a rectangular shaped tube B is shown, this is to illustrate that ither a series of circular or other shaped tubes B may be employed, at each side of the oven or if desired a single rectangular shaped tube may be substituted for the said circular tubes B.

If desired any suitable non-conducting material F such as asbestos may be fitted inside the oven where necessary or desirable in order to retain the heat therein. If preferred, the flues G O and C can be made in the briclework or other setting where the oven is intended to be built in a chimney or the like. Moreover, it will be readily understood that the improvements can be as readily adapted to ovens designed for setting in brickwork as to those made to stand independently thereof.

'What I do claim is 1. In a heater the combination of a frame or casing provided with an oven chamber, a the place, a chamber disposed above the oven chamber and subdivided by fixed walls providing non-communicating compartments, an outlet flue, one of said compartments being in constant communication with the fire place and the other with the outlet flue, up and down draftconduct-ors on each of the opposite sides of and within the oven chamber and communicating at their upper ends with the respective compartments of Said upper chamber, horizontal conductors connecting the lower ends of said up and down draft conductorsv in pairs, said horizontal conductors having normally opened beveled ends, and gravity closing doors guarding the said beveled opened end of said horizontal conductors.

2. In av heater, the combination of aframe or casing .provided with an oven chamber, a fire place disposed centrally at the top of the frame or casing and out of communication with the oven chamber, a chamber disposed above the oven chamber and provided with fixed walls forming compartments, one of said compartments being always in communication with the fire place .and the other out of communication therewith, an outlet communicating with the latter named compartment, and up and down draft conductors on each of the opposite sides of and within the oven chamber and communicating at their lower ends with each other and at their upper ends with the respective compartments.

3. In a heater, the combination of a frame or casing provided with an oven chamber, a fire place disposed centrally at the top of the oven chamber and out of communication therewith, an outlet flue, a pair of superposed, non-communicating compartments at the top of the frame or casing above the oven chamber, the lower compartment being in communication with the outlet and the upper compartment in communication with the fire place, long and short up and down draft lines on each of the opposite sides of and within the oven chamber, the long fiues communicating with the upper compartment and the short flues with the lower compartment, said fines alternating at opposite sides of the casing, and horizontal conductors connecting the lower end of each long flue at one side of the oven chamber with the lower end of a short flue at the opposite side of the oven chamber.

l. In a heater, the combination of aframe or casing having an oven chamber, a chamber disposed above the oven chamber and subdivided to provide compartments, a fireplace communicating with one of said compartments, an outlet communicating with the other compartment, vertical down draft and up draft fiues arranged on each of the opposite sides of the oven chamber and c0mmunicating at their upper ends with said compartments, and horizontal flues connecting the lower ends of the vertical flues in pairs, said horizontal flues having beveled open end portions, and gravity doors for normally closing the same.

In witness whereof I have signed this specification in the presence of two witnesses.

CHARLES HOPE DOUGLAS HUNTER.

Witnesses:

A L. CAREN, A. J. OALLINAN.

Copies of thin patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0. 

